Studies on the Benthos of Tokyo Bay

By using a modified Ekmann type bottom sampler, seasonal sampling of the benthos was made in Tokyo Bay from May, 1947 to July, '49. The benthic animals, especially Polychaeta, studied biogeographically. The analysis of data indicates the facts as shown below. The dominant species have their regular habitat and they inhabit mostly one by one. The Bay is ronghly divided into fonr areas, according to the composition and the tempera-ture of the bottom mud and the other environmental conditions with reference to the benthos. And these areas are in close connection with crop of benthic fishes.